Differences in clinical characteristics and frequency of accompanying migraine features in episodic and chronic cluster headache

Cephalalgia, 04/27/2012Gaul C et al.

Occurrence of cranial autonomic symptom (CAS) and attack frequency, as well as periodic patterns of attacks, are relatively uniform in eCH and chronic cluster headache (cCH). Multiple CAS are not related to pain intensity. Allodynia during cluster attacks is a frequent symptom. The unexpectedly high rate of accompanying migrainous features during cluster attacks cannot be explained by comorbid migraine.